铸造—热压变形Pr17Fe76.5B5Cu1.5永磁合金的组织结构与性能

研究了Ｐｒ１７Ｆｅ７６．５Ｂ５Ｃｕ１．５永磁合金经铸造和热压变形量分别为０,３０％,５０％和７０％后,样品的成分、组织、性能随变形量的变化。随热压变形量的增加,样品的Ｐｒ和Ｃｕ的含量降低,而Ｆｅ和Ｂ的相对含量提高;各向异性和各种磁参量,如μ０Ｍｓ,Ｂｒ,ｉＨｃ,ｂＨｃ和（ＢＨ）ｍ均提高。热变形量大于８０％,并经最佳热处理后样品的性能达到：Ｂｒ＝１．２Ｔ,ｉＨｃ＝１．２２ＭＡ／ｍ,（ＢＨ）ｍ＝２６０ｋＪ／ｍ３,与烧结Ｐｒ－Ｆｅ－Ｂ永磁体的性能相当。     

2.1μm Co∶MgF_2脉冲激光器

报导了２１μｍＣｏ∶ＭｇＦ２激光器在室温下的实验结果,得到了０２７９Ｊ的２１μｍ激光,器件效率为１４５％测定了Ｃｏ浓度为３％（ｗｔ）的ＭｇＦ２晶体对１３４１４μｍ线的偏振吸收系数,测量结果表明,对该谱线π偏振和σ偏振的吸收系数分别为０８０４ｃｍ－１和０５１６ｃｍ－１．激光实验结果计算得到该晶体２１μｍ线的激光跃迁截面为２６１×１０－２１ｃｍ２．     

微细氧化镍粉的制备(英文)

以硫酸镍为原料,用草酸盐淀淀－煅烧方法制备了粒度为１－５μｍ的微细氧化镍颗粒。得出了最佳工艺条件：ｃ（ＮｉＳＯ４）＝０．５－１．５ｍｏｌ／Ｌ,ｎ（Ｃ２ｏ６２－４）：ｎ（Ｎｉ＾２＋）＝１．２－１．３：１,ｐＨ＝４－５,沉淀温度４０－５５℃,煅烧温度５００－９００℃,煅烧时间４－６ｈ。     

四川锂辉石生产单水氢氧化锂烧结条件研究

对四川锂辉石、石灰石生产单水氢氧化锂烧结过程的条件进行了研究，确定了烧结过程的最佳条件：粒度－２００目≥９０％；配比锂辉石：石灰石＝１∶３．２±３％；温度１１００℃～１１６０℃；时间４０±５ｍｉｎ．通过试验验证了烧结反应机理，确立了按组成配料法的科学性和实用性     

分光光度法测定药物及生化样品中的铋

在ＰＨ４．５－６．５的六次甲基四胺－盐酸介质中，水杨基荧光酮－溴化十六烷基三甲铵－Ｂｉ（Ⅲ）－硫脲形成一种红色络的，春最大吸收波长为５５０ｎｍ，表观摩尔吸收系数为１．３５＊１０＾５Ｌ．ｍｏｌ＾－１．ｃｍ＾－１，铋量在１－３０μｇ／２５ｍｌ范围内符合比尔定律。直接测定药物及生化样品中的铋，回收率达９６％。     

DApBM—V（Ⅴ）—Mn（Ⅱ）—Twenn—80体系光度法测定钒（Ⅴ）

在磷酸介质中，在Ｍｎ和Ｔｗｅｅｎ－８０存在下，ＤＡｐＢＭ与钒生成橙黄色化合物，产物至少可稳定３．５ｈ，最大吸收波长为４８５ｎｍ。摩尔吸光系数ε＝４．０１×１０＾５Ｌ．ｍｏｌ＾－１．ｃｍ＾－１和ε＝１．５７×１０＾４Ｌ．ｍｏｌ＾－１．ｃｍ＾－１，钒量在０．５－３．０μｇ／２５ｍｌ及３．０－１０．０μ／２５ｍｌ间符合比尔定律。     

非均匀结构WC－Co硬质合金

对采用碳化烧结法制取非均匀结构硬质合金的工艺进行了研究，结果表明，碳化烧结工艺可制得非均匀结构ＷＣ－Ｃｏ硬质合金，配Ｃ量以６．０％～６．１％（质量分数）较好，最佳烧结温度为１４２０～１４５０℃，ＷＣ－１０％Ｃｏ（质量分数）合金的抗弯强度σｂｂ可达２６００～２９００ＭＰａ，密度ρ为１４．４～１４．６ｇ／ｃｍ３，硬度ＨＲＡ为８８．２～８９．９．此外，还可以获得ＷＣ＜ｌμｍ的合金。     

双硫腙直接光度法测定人发中的铅

研究了用非离子表面活性剂Ｔｗｅｅｎ２０作为增溶剂，双硫腙水相直接光度法测定人发中铅。在２５ｍＬ中含０～１０μｇ铅符合比尔定律，ε值可达１．３ｘ１０￣５Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１），标准加入回收率为９９％～１０２％．     

新显色剂5－（4＇－氯－2＇羧基苯偶氮）绕丹宁与银的显色反应及其应用研究

在ＴｒｉｔｏｎＸ－１００存在下，ｐＨ＝５．０～５．５时，新试剂Ｃｌ－ＲＡＣＰ与银生成配合物，其最大吸收波长为５００ｎｍ，配合物的配位比为１：２，表观摩尔吸光系数为１．１×１０￣５·Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１）。Ａｇ（Ⅰ）的浓度在０～２．０μｇ·ｍｌ￣（－１）范围内符合比尔定律。该法用于阳极泥和废定影中银的测定，结果较满意，相对标准偏差为１％。     

从香菇发酵醪液中分离鸟苷酸技术的研究

香菇发酵醪处理液经７３２阳树脂在ｐＨ２．５￣３．０时得５＇－ＧＭＰ和５＇－ＣＭＰ混合液，再调至ｐＨ４．０￣４．５上７１７阴离子树脂柱，５＇－ＧＭＰ被吸附，用ψ＝３％ＮａＣｌ溶液解吸，即分离得５＇－ＧＭＰ。醪液经０．２μｍ胶体磨破壁后分别作了自溶，酶解（５＇－磷酸二脂酶）和自溶加酶解三种处理，结果５＇－ＧＭＰ得率分别为９４．０％，９５．１％和９５．０％，未见显著差异。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has